**ACEADI.DOC file Jul/13/1998

                        ACECAD ADI Driver
                        =================

When you install the tablet for Windows, all of your Windows 
applications are taken care of at the same time. You can use the tablet 
with your Windows environment and all Windows applications which of 
course include Autodesk applications for Windows. If your Autodesk 
application for Windows also supports a WinTab compatible tablet, you 
can configure the digitizer options of the application as a WinTab 
compatible tablet. In this situation, you can use the tablet as both a 
Windows system pointing device for all Windows applications and also as 
a pointing device of templates provided by these applications such as 
AutoCAD for Windows.

You can use the tablet with your Autodesk DOS applications which support 
ACECAT, MM1201 tablet, Microsoft Mouse or Mouse Systems Mouse.

For  Autodesk applications on the DOS platform, the tablet also provides 
two kinds of ADI drivers. If your Autodesk DOS application supports only 
MM1201 but does not support  ACECAT, we recommend using the ADI driver 
with the application. The two ADI drivers which are included on the 
Driver/Utilities Diskette  are  as follows:

*  Protected Mode ADI Driver - DGPACECD.EXP which provides an interface
        that allows the tablet to be used as a input device for many
        of the 80386 (or above) based software applications of Autodesk,
        Inc. For best performance, we recommend using the Protected
        Mode ADI driver.

*  Real Mode ADI Driver - ATABLET.COM which is not only an enhanced
        DOS mouse emulator driver but also a Real Mode ADI driver that 
        allows the tablet to be used as an input device for many of 
        the software applications of Autodesk, Inc. If your Autodesk 
        application does not support Protected  Mode ADI, you may use 
        the Real Mode ADI driver with the application.


Installing the Protected Mode ADI Driver
========================================

The following assumes that you are installing the driver for AutoCAD 386 
for DOS including R11 or later version. If you are using an AutoCAD 
older version, rather than R11 or later version, or a different Autodesk 
product, refer to the documentation for that product for installation 
details.

To install the DGPACECD.EXP Protected Mode ADI driver into AutoCAD R11
or later versions, please refer to the section - Installing the Drivers
Using Easy Auto-Install Program in the README.DOC file in the root directory.


Loading the Real Mode ADI Driver
================================

The other type of ADI driver we provide is the Real Mode ADI driver and 
it is included in the ATABLET Mouse driver. This feature is very helpful 
for users who frequently switch working environments between DOS 
applications needing the Mouse driver and Autodesk DOS applications 
needing the Real Mode ADI driver. Before you begin to load the Real Mode 
ADI driver, you must first install the ATABLET driver. Please refer to 
the section - Installing the Drivers Using Easy Auto-Install Program in 
the README.DOC file in the root directory.

Once you load the Real Mode ADI driver, it remains in memory until you 
reboot your computer or turn it off. Within Autodesk applications, 
select the Real Mode ADI driver option for the digitizer options. The 
Real Mode ADI driver is always installed on interrupt 79H, which is the 
application default.

To load the ADI driver, type the following command at the DOS prompt and
press <enter>.:

        ATABLET  [/prm] [/prm][...

                where /prm is an optional parameter(s) described below.

        Or

        Use a batch file to execute ATABLET.COM and your application in 
        sequence. Insert the above command at the position before the 
        command line that launches your Autodesk DOS application in your 
        batch command file.

The driver will display some messages on the screen which show the installation
status and the aspect ratio value.

Note!   The /prm could be combined together with other parameters for the 
        DOS mouse driver function on the same command line. I.E. you can load
        the DOS mouse driver and the Real Mode ADI driver at the same time.


Parameter Descriptions
======================

   Enable the ADI Function - /ADION
   --------------------------------
        This parameter will install the DOS mouse driver with the Real 
        Mode ADI driver function.

   Disable the ADI Function - /ADIOFF
   ----------------------------------

        This parameter will disable the Real Mode ADI driver function but 
        the DOS mouse emulator driver is still active.

   Set the Aspect Ratio for ADI - /X## or /Y##
   -------------------------------------------

        These two parameters provide you with a method to preserve the 
        aspect ratio of the tracking area to the screen. The default 
        tracking area is the whole active area of the tablet. You can 
        use the /C parameter to change the tracking area within the whole 
        active area. (please refer to the parameter descriptions about 
        ATABLET driver in the section - Parameter Descriptions in the
        ATABLET.DOC file)

        This Aspect Ratio setting feature is designed for users who need 
        to trace a precise drawing. For selecting menu options or simple 
        pointer movements, this setting is not required. The new aspect 
        ratio will be formed by the ratio of the two numbers specified by 
        /X## and /Y##.

        The ## is a decimal number in the range of 20 - 80. Default value
        is 50. Please refer to the command examples for the use of these two
        parameters.


Command Examples
================

*****  C:\>ATABLET /1 /ADION

        This command loads the ATABLET driver with the Real Mode ADI 
        driver function enabled and sets it to communicate with COM1.

*****   C:\>ATABLET /ADIOFF

        This command disables Real Mode ADI driver function but the DOS 
        mouse emulator driver is still active.

*****   C:\>ATABLET /ADION /X64 /Y48

        This example shows how to set the aspect ratio for the standard 
        VGA resolution(640 x 480). When this command is executed, you will 
        find the following message lines on the screen.

        Real Mode ADI Driver installed on INT 79h
        Screen Aspect Ratio = 0.75

